What is the primary reason for providing a minimum area of flexural reinforcement A_ s,min in a reinforced concrete beam?

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Civil Engineering QUESTION #6626

Question 1

What is the primary reason for providing a minimum area of flexural reinforcement $A_{s,min}$ in a reinforced concrete beam?

To prevent sudden failure upon cracking✔️
To control long-term deflection
To ensure the concrete reaches its ultimate strain
To resist shear forces near the supports

Correct Answer Explanation

The minimum reinforcement ensures that the cracked moment capacity of the section is greater than the uncracked moment capacity, preventing brittle failure immediately upon the first crack.

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